AMSAT-BB January 2009

186 participants
322 discussions

Call for Papers--2007 ARRL/TAPR Digital Communications Conference

by Ford, Steve, WB8IMY

Technical papers are solicited for presentation at the 26th Annual ARRL and TAPR Digital Communications Conference to be held September 28-30, 2007 in Hartford, Connecticut. These papers will also be published in the Conference Proceedings (you do NOT need to attend the conference to have your paper included in the Proceedings). The submission deadline is July 31, 2007. Please send papers to: Maty Weinberg ARRL 225 Main St Newington, CT 06111 or you can make your submission via e-mail to: maty(a)arrl.org Papers will be published exactly as submitted and authors will retain all rights. 73 . . . Steve, WB8IMY ARRL

9 years, 11 months

ISS Packet 13.44utc UK Pass

by David Barber

Accessible again this pass (1200bps) but something up there has changed. Very quiet today (few stations) and very difficult to get through in comparison to recent days. David G8OQW

13 years, 3 months

Optimum HT for FM satellite use?

by Gordon Bousman

I'm getting started in satellite work and interested in purchasing a suitable HT for portable satellite use using an Arrow antenna. Wondering what is considered to be an optimum HT especially considering ease of managing the Doppler shift during a pass. I understand that the HT must be full duplex capable and thus rules out some models. Thanks, Gordon, NW7D

13 years, 4 months

AO-51 SSTV

by Allen Vinegar

If anyone copied my transmission last night I would greatly appreciate receiving a copy of the picture. Thank you very much. 73, Al W8KHP

13 years, 4 months

Portable 70cm sat antenna

by Doug Kuitula

Hi all, Take a look at page 41 of the February 2009 copy of QST. Juan EA4CYQ, and Pedro EB4DKA, have an interesting design for a portable 70cm antenna for LEO satellite work. It's called a "CJU" antenna. I'll let you read the article to find out what it stands for. It's basically the io half of an IOio antenna. Has anyone had any experience with the IOio? For the homebrewers out there, it's worth taking a look at. 73 de Doug KA8QCU

13 years, 4 months

AGWPE serial Loopback Interface !!

by nader omer

Hi All I found this information on SV2AGW's webside http://www.sv2agw.com. Serial LoopBack Interface An Utility that creates a Virtual Serial Port for programs that have no native support for Packet Engine, like Wisp. Author Tim Pearson, KB9VQF. ................................................... Dose any one try this software with wisp?? thanks in advance Nader,st2nh www.st2nh.com

13 years, 4 months

AO7 9A2SB

by k3szh＠netzero.com

Congratulation Zlatko on your 1000 plus qsos on AO7 A&B. You are a popular and a fine operator. Tnx for the many short qsos we have together. 73 Joe K3SZH AMSAT 3788 since 1976 ____________________________________________________________ FTD.com Shop now and save $15 on Flowers and Gifts from FTD! http://thirdpartyoffers.netzero.net/TGL2241/fc/u4MuSdTxakCyx0W4ABIFmNH5fCMB…

13 years, 4 months

S band rx on ebay

by w7lrd＠comcast.net

Hello I am cleaning up the ham shack, and trying to raise a few bucks for a hamfest in March so I can get more goodies. That's a real oxymoron! http://shop.ebay.com/items/?_nkw=s+band+satellites&_sacat=0&_fromfsb=&_trks… 73 Bob W7LRD AMSAT 28498 -- "if this were easy, everyone would be doing it"

13 years, 4 months

crossed yagi antenna - wanted

by Fer

A good friend of mine is starting satellite activities and he is looking for a VHF and UHF crossed yagi antenna with: 1) circular right and circular left polarization, selectable by relay 2) no more than 4.5 meter boom lenght (obstacle) 3) available in Europe Strange to say but seems difficult to find nowadays antenna like KLM 2M-14c. Anybody can tell us, out of list, a store in Europe where we can buy such antenna? thanks 73, Fer IW1DTU

13 years, 4 months

Delfi-C3 / DO-64 status update January 29th 2009 10:00 UTC

by Wouter Jan Ubbels

Hi all, please find a status update of the Delfi-C3 / DO-64 satellite below. 1. Following our earlier reports about the transponder issue, we sadly have had to conclude that the linear transponder is not operational anymore. Delfi-C3 / DO-64 has been in basic mode (a mode in which only housekeeping mode is transmitted) for a number of months in order to investigate this issue. Following our extensive tests, we have decided to switch the satellite back to science mode, which from a mission point of view is the most useful mode since it yields valuable science data about the Thin Film Solar Cell payload and the Autonomous Wireless Sun Sensor payload. 2. Today during the 09:33 UTC pass we have successfully commanded the satellite to science mode using the primary downlink at 145.870MHz, 1200Bd AX.25 BPSK and stored this mode in the on board data base. Subsequent database dumps indicated that the new settings have been stored successfully. This mode is recognized by the higher rate of telemetry frames on the downlink, 3 payload frames are transmitted followed by 1 housekeeping frame. Note that the satellite boots in this mode on 145.870MHz whenever she comes out of eclipse (no battery on board). It is possible, that the satellite decides to use the 145.930 MHz backup downlink. If you hear Delfi-C3 / DO-64 on this frequency, your reports are highly appreciated! 3. Contrary to basic mode, in which the downlink is on continuously, downlink drop outs are likely to occur in science mode. Therefore, it is possible that the satellite is not heard, and due to the orbit, the chances that the downlink is still on over VK / ZL are slim, sorry to all of you down under! However, if you hear the satellite, your reports are very much appreciated! We regularly post the satellite status on the Oscar status page at http://oscar.dcarr.org/ and encourage you to do so as well. 4. Telemetry can be received using the RASCAL program, which is available at http://www.delfic3.nl/rascal At this moment, the total amount of frames has exceeded the 500000 mark, more precisely 504364 (which amounts to approx. 72.14 MB), a truly magnificent number. Thanks once again to all of you receiving and submitting telemetry! When in science mode, the IV curves of the Thin Film Solar Cell payload can be viewed by clicking "options" --> "show IV curves". Best 73 on behalf of the Delfi-C3 / DO-64 team, Wouter Jan Ubbels PE4WJ

13 years, 4 months

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AMSAT-BB January 2009